An SOS signal made of rocks in a remote part of Western Australia has prompted fears that someone, or more than one person, could be missing.

近日，西澳大利亚偏远地区发现了一个由石头堆成的SOS信号，人们担心可能不止一个人失踪了。

The distress¹ signal was spotted² by a helicopter pilot. It led to a ground search by police who had to reach the area by air because of tough terrain³.

该求救信号是被一名直升机飞行员发现的。随后警方展开地面搜查，由于地势艰难，警察必须乘飞机到达该地区。

Authorities have now appealed for public help after failing to find "any indication of recent human activity".

在没有找到“任何近期人类活动迹象”后，有关部门现在已经呼吁公众帮忙。

However, police said they had discovered the remains⁴ of a campsite at the scene, which is at Swift Bay about 500km (300 miles) from the city of Broome.

但是警方表示，他们发现现场--就在距离布鲁姆市约500公里（300英里）处的斯威夫特湾有露营的痕迹。

"Police are trying to establish if there are any missing persons in the area who require assistance," they said in a statement.

警方在一则声明中称：“我们正在设法确定该地区是否有任何需要援助的失踪人员。”

Senior Sgt Peter Reeves told the Australian Broadcasting Corp that the message may have been there for years.

警长彼得·里弗斯向澳大利亚广播公司透露，这个信号可能已经在那儿好几年了。

"There are indications that there may have been someone camped there at one point in time, but it is just not clear how long ago that was," he said.

他表示：“有迹象表明，可能有人在那里露营过，但是不清楚是多久以前的。”